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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc4e2ecde37bd609b1f2711efb54546d1c6e6d51930af13ea8fc8eff6ee574a1' 
  AND token = 'BjSKE8xO2zWPog+MHPCUdDbOoU6N/VL7xOwHiL7N3/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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