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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d4a1375d3ecd6476781be9ab587b4c4f1163f478820f2d6481c102324094574' 
  AND token = 'h0BHaaCsoidtV17ctGw6gb+vQPffCvXE7gnwwmnediM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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