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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfbf2f570f86a97cee48a9552e1e926fff4d75b6c84471ec8b8650834bb296ab' 
  AND token = 'H+IHbyQsWRjny+2NxvRj800Ei9uvXhvYayduw5sbsVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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