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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dad768f00627f1cde76c202cb396a7c6259927b44c63e3f5eeeb57932775e80' 
  AND token = 'YwJr+A1U0hG14JGPCLepNTf71SQYekskbuQaW7g69Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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