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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '744966c045207c0cc6deb0b9bee1ad6cb33bed1e781163bd88fd4a432de4927c' 
  AND token = 'o/xPffN/gdo4zWATZr4ACgbF6Erawm021xxEItsxZ9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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