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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48d71e686fcdb11ffca0ce50b4e22e5501b80a8f07bb98b9e59fafd7b4f1ee15' 
  AND token = '7T7l4h2RM5LcmZ9KtecWiflHhsDYIdBOJbE9NSOGYkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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