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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6501658b29a356847063e7bc8e7156372b5081e3edf533d43a2e0659443f9f6e' 
  AND token = 'ByZtTUes7mZERt1Wvl43lsV6N94eagO4uftTCxOMA+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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