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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd459188bbff389a0ca72453ae98cfddab01852d653a2f5b7c164dcf35ac538ff' 
  AND token = '3Tb6y1UBGiIvyiaTK0UW0+NwzGyryZsr3c7EqTWESlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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