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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c7a542345e04269b740b48c657203caac3a6feaa76cc461d10fae73f4395f80' 
  AND token = 'v5HVqoheFT7/M7G3tu/gY5B3WITGeUK4U0oyOqIxLEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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