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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94753cc4169ef9a7c61f11c6e9cb971707f8970b11c8e36a537aded84cefe1ac' 
  AND token = 'HY6512Q2OZkuIevwB+19Nf0bJhkBylr2JcWENcLZIoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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