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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bda290f1cf3af46f9f55af001ad99f62893608e9a075496315fef13713e97a4a' 
  AND token = 'KOKwAfWuF5Crpzcy7/Xb6eOFVgudClDzLiP5NmbUqqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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