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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9f856a74161a8c03e4773a40db7b807c5b96b2615d43c6725581779ad9a4cef' 
  AND token = 'ihMAakFQb7Dsego3WVOv7TVCH+uGceLKNM1m+eXU2Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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