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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b63a7d2854c6ec36412681b9d79e8634273a95cc39a730c5756df026fad4034' 
  AND token = 'xqeFMBbYR9LKUShXcIHBPAW20arFtDUBXDmipcTIjAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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