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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb9a140c20beb71a3dd9e566991bc564f5077a209ee51d9ed8bb4ac2c4ac414a' 
  AND token = 'MAV1+X0n5bAeB3bd8KeY4KyML38Myk7U6BURnzOajQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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