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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fa31a7f614440a84966ed57013e6b57902dc4ba1f6bd1b7871772c632cafd92' 
  AND token = 'VswQpnHxelLamABqxJ3PcqerPUOye6PqQ2/Yf5M3N/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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