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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c942b0b86f7da5793ec0f2b806618c3b335ad181e4e75f763909a0e26f3f4b3' 
  AND token = 'jsLz06b48zGS/1/i4TAG3gLr/x++mozE9bw3/QA4cDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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