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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a7ad254b64936b8ba04b5326d8530340154523981feaa884cceb1bf9102f937' 
  AND token = 'a1j3Pmk8z86WAL4Jdcdkq1Wi77KMsLKOMgiV3NQWi/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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