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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd9ca5dd6a24a6c30a69b4c6efaf2092c51048de3275476b85f8ee263e154bab' 
  AND token = 'zy7dJjLuA+9MpANxpbiJ4jiCgT8B5XwCGAZGf2TJ7f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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