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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6803eb19bbf2f27786f3af9a0c6f8c8c3a255061568cff93294e9e62d78c21f4' 
  AND token = 'T0N5YYiHMZM1RduOqYv7SI1adGqUHtBoCOB757MLeK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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