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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ac13ffe55c55e164521bd895cb9534778ac5cc757e2b8680bce99c1ac833849' 
  AND token = 'vpsKj2GCfithBQbNqFnlQkM6beEZVGdh2c98U+eEcEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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