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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9411a6e964bfd1f4cc3d8519b54c109b8959802bde02d98e4b35010fb9f66ec3' 
  AND token = '4Za+a+FFHkhX6SGt13NI8ojVm3cBGkr+dfzEt1fa1xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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