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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aec13078d208b915c309fadc6828361673aa8cbd0e7ed4e471d077276a539168' 
  AND token = 'L44ELV2aJbEhj9RKKK21UfeY5ttx6UA910xnpUKuN+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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