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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60571bafae1ccbf9684ef03c4cdc9dc0a39aac70eb4a1a16e4bd07ec4d55e542' 
  AND token = '2mpCeF7tQnILdQNut3QJFemyuksQVMyoweeSNfle6dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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