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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '510ef2ce8af3c8e0917ead85beeeffc69eb1bb6d657b122140e736b3c784eb83' 
  AND token = 'vvT73dKfAp0kRgL7UGiG3zbMFxRUmxdihlYQ7MFT1Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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