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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bc7d36d8fbfbe548c6ea4383f94f679cdc5f543bec323381e7d5f9a58ebc3b7' 
  AND token = 'CcXzC+NlAIw6xA9T8ltu0pIeOzwRhkxiTeeIePGQtCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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