SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e42201579d34a4b9907f17807abab914bef3bcf1153ae879acdab2a51e6fa91' 
  AND token = 'HfXiX+U53cqYZCLpr2W5d+K+DhG1HgHT1sVTRhKv6Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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