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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4adccc5db41628345bdf95fd9ae23c6c2c2b916738a3273987df2219071b16a3' 
  AND token = 'Uz6zIwLotkFkPl3Lle0sVO29LwbLzGJt1uz5d+UWD3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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