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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '025a193b4668d5e18798ef62bdde67812a3f858abe8b3b2ec0809b8eaa160fcd' 
  AND token = 'yCyMVrKl2MELmLqqAbhXb44+585SMlLO1CAgpckmltk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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