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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a740f476f57bf4f416368071506f764a52fe44e0a203e93c6363c3923cf3b0d' 
  AND token = 'dGD4nxkn3kHV5I1efs50fESG0MIwAZe5XibjPL5gdmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}