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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5623dded371b1a7e875ea88cd050688b1cab6812e2b309203dabcb07ea067a36' 
  AND token = '3qbcX7dKanCpMkC4SVw/As6rgWbrasM63BaM3oWHDwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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