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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f54c9223e40ab65e9f54fffb7a6a05da04c0d508fa3084ac578a96e950c86e12' 
  AND token = 'QpUlPLOdXVvKV0EUdDSZBLaMrT5MTQdtigvBMhDY6wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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