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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b538d1fb9303a1f9be23917d6bf566a30a28f9698a205ea693e4a6a7011d1a8f' 
  AND token = '/8zaIGZfgXT9O5EZ9bmHkKVROmkUacwjelMmCb62vg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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