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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe679d8b76498463ab31bacf3060638ea4f5002df5cab41839ec805a45661aa6' 
  AND token = 'ApBb7O+58qjXANC9fNwJPIPolAGgxdESnOddsLsnT6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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