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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5047b3b81d55040821ac2e5fcbaa4010a7e4bb230b1d69a13f087465448b8e44' 
  AND token = 'K2QiuiHoNRz2qYV0W7HsduQ5g0IGs7+flIL4a0XU3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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