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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee2b21c216dd455dc01f9cca2eb1b86e4bb08ac2c63d3bab3e2aef3881dd3bda' 
  AND token = 'JlmjuATXFbQXqj+p+Ko9P3eeOG26uU7MM9bxwbrabwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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