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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18020a15909ecac2e06b8e17fe71379e1b01f617b1f1cf75eafa92e7f4af2066' 
  AND token = 'cRLwfVovntUmuV8Cc5BkAjfmMibdIqhWFDbdVPXFQBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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