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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b4b18a4a65a3add13b3eec18be0f2ca92a39e6a167352c01b0b425dc14c4304' 
  AND token = 'g9YIENrHrubWoEUvhTJkHlU0m3FDqZK35H6HIeey41M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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