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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c04c40e5624dfb2410c0d77e0303c02c826cd5ddb306a3dac0a9e0e526c93c0' 
  AND token = 't7pckqJ6JF/OGA7aY6g/m6uJ063k5Wl1cBz5FLlqC8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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