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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6dbc545e2f872cd3a20dc9aa5491c9826d8fd4c5fb54b89baaadd1b7b880414' 
  AND token = 'QFoG16QQkdeY8DAsHWeD2xPvqs9f0Eo42kglgGFuNuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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