SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9451f38362e497976c0015ca52460d0e621976a68f4aa51743a76501569b2a9' 
  AND token = '+igZ9nLbDjlilKiI8XF1ImwWv8U/wHqDs1yHxAHB08w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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