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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a141dffb5368c63483db19161ddf841a0cb12e12e9b8c63a9ae43749f6ccf8d' 
  AND token = 'tysF9DzY+6ErT18WCI8sCa//08dQDRMxZ014NbTrCCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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