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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab3b2f926bf4c7cdee0ab596f07efba422ad418f92472b9f95688c39cde324f1' 
  AND token = '9Vg1nL4jBAXTD+bBQ3caXroULNL9AQUN2ftJSla1HeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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