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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41022d58d4938b899831f4d865eb571687137e662473bcffb9f5a326faf0d203' 
  AND token = 'TeCi79oiOeTE3BaxDr0nlKompewKFYp19/sAQKz9gpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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